How do you know when a destination hasn't been trammeled by Americans? When it's a challenge to find locals who speak English. Such is the charm of the Dominican Republic, which has long been on the radar of A-listers (Oscar de la Renta, the Clintons); now, with low fares on JetBlue, it's even easier (and less expensive) to get to. The Sivory Punta Cana, a 55-suite property open since December and situated on a long expanse of untouched beach, offers visitors a low-key hideaway.